Hi, my users can not ad comments, because the box with the two words they have to write is gone! Where can I reaktivate this. Hope somebody can help.

I believe you mean the reCaptcha box. The parameter to re-enable it is at the general parameters of K2 at the backend.

Hi again, the reCaptcha box was already enabled, but the public key and the private key was missing. I got new keys from my google acount and inserted them i the general parameters of K2. Now the reCaptcha box is displayed but when I klik the submit button I get the message " Could not open socket ". ?? :-(

Please, someone reply to this comment, I've got the same issue...